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MacDown 3000 vs Apostrophe: catalog facts
MacDown 3000	Apostrophe
Free Free and open source.	Free Free and open source under the GPL-3.0-or-later licence.
macOS	Linux
Side-by-side live preview GitHub Flavored Markdown support	Focus mode for distraction-free writing Live rendered preview
macOS only A focused editor without note organisation or sync	Linux only Edits single files rather than managing a notes library
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0-or-later
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.